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6 .7 .1
Single channel, THC or RTD input
The MTL5573 converts a low-level dc signal from a temperature sensor mounted
in a hazardous area into a 4/20mA current for driving a safe-area load. Software
selectable features include linearisation, ranging, monitoring, testing and tagging for all
thermocouple types and 2-, 3- or 4-wire RTDs. (For thermocouple applications the HAZ-
CJC plug on terminals 1–3 includes an integral CJC sensor). Configuration is carried out
using a personal computer.
3
Figure 6 .32:
Top labels for
MTL5573
Top label
Use the following LED information to understand the module status.
Status
Power ON
Insufficient voltage or Power OFF
Normal working
Device failure
Sensor failure/Error
Early burnout detection (EBD)
51
MTL5573 - Temperature Converter
Hazardous area
Safe area
6
4-wire
5
4
3-wire
+
3
mV
2
–
1
Terminal
Function
1
THC/EMF/RTD input –ve
3
THC/EMF/RTD input +ve
4
3-wire RTD input –ve
5
4-wire RTD input +ve
11
Output –ve
12
Output +ve
13
Supply –ve
14
Supply +ve
Configuration
socket
7
8
9
mV
Load
10
–
11
I
4/20mA
12
+
13
Vs–
14
Vs+
20 to 35V dc
PWR (green)
STS(yellow)
ON
OFF
ON
FLASH
FLASH
FAST FLASH
INM 5500 Rev 11
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